Answer:
What is ^ for?
Explanation:
A solution is prepared by dissolving 25.0 mL ethanol, CH3CH2OH (d=0.789 g/mL), in enough water to produce 250.0 mL solution. What is the molarity of ethanol in the solution?
The molarity = 1.716 M
Further explanationGiven
25 ml ethanol
d = 0.789 g/ml
250 ml solution
Required
The molarity
Solution
Molarity shows the number of moles of solute in every 1 liter of solute or mmol in each ml of solution
[tex]\large{\boxed {\bold {M ~ = ~ \frac {n} {V}}}[/tex]
mass of ethanol :
= 25 ml x 0.789 g/ml
= 19.725 g
mol ethanol :
= 19.725 g : 46 g/mol
= 0.429
The molarity :
= 0.429 : 0.25 L
= 1.716 M
The molarity of ethanol in the solution is 1.716M
What is the molarity of a solution?Molarity shows the number of moles of solute in every 1 liter of solute or mmol in each ml of solution
Determine the mass of ethanol :
Mass of ethanol = 25 ml x 0.789 g/ml
Mass of ethanol = 19.725 g
Determine the moles of ethanol
Moles = Mass/Molar mass
Moles = 19.725 g/46 g/mol
Moles of ethanol = 0.429moles
Calculate the molarity using the formula below;
Molarity = Moles/Volume
Molarity = 0.429/0.25 L
Molarity = 1.716 M
Hence the molarity of ethanol in the solution is 1.716M
Learn more on molarity here: https://brainly.com/question/17138838
what type of boundary is formed when two continental plates converge, buckle and push up into mountain rages?
Answer: Convergent Boundary
Explanation:
Two plates converge at one point
Which of the following notations represents an alpha particle?
A. 2 He
C.B+
В. В
D. Y
Answer:
A. 2 He
Explanation:
The notation of an alpha particle is depicted as:
₂He
An alpha particles is a nucleus of 2 protons and 2 neutrons. So it is actually a Helium cation.
Alpha particles are monoenergetic and they mostly have discrete energy.
So, the mass number of the particle is 4 and atomic number is 2
PLEASE HELP!!!! SCIENCE PROBLEM
indicator, hope this helps :
Answer:
B
Explanation:
Because that's what is being changed into a different color.
What is made when a salt is dissolved in water?
Answer:
water
Explanation:
the salt dissapears and turns
into vapor
Answer:
A solution is made when a solid (which we call a solute) dissolves into a liquid (that we call the solvent) one example of a solution is salt dissolved in water. The salt and water can be separated again by evaporation (the water will evaporate if left in a got place leaving the salt behind. I don't know if that was the answer that you were looking for
compute the mass-specific enthalpy change associated with Nz that is undergoing a change in state from 400 k to 800 k
Answer:
The correct answer is "430 kJ/kg". A further explanation is given below.
Explanation:
The given values are:
T₁ = 400 k
T₂ = 800 k
The average temperature will be:
= [tex]\frac{T_1+T_2}{2}[/tex]
= [tex]\frac{400+800}{2}[/tex]
= [tex]600 \ k[/tex]
From table,
At 600 k the [tex]C p[/tex] will be = 1.075
Now,
⇒ The specific enthalpy = [tex]Cp(T_2-T_1)[/tex]
⇒ [tex]\Delta h=1.075 (800-700)[/tex]
⇒ [tex]=430 \ kJ/kg[/tex]
WORTH 20 POINTS! MY LIFE DEPENDS ON IT HELP
Why do atoms share electrons in covalent bonds?
1. to become ions and attract each other
2. to fill their valence shell
3. to become more polar
4. to increase their atomic numbers
Answer:
2
Explanation:
Covalent bonding occurs when pairs of electrons are shared by atoms. Atoms will covalently bond with other atoms in order to gain more stability, which is gained by forming a full electron shell. By sharing their outer most (valence) electrons, atoms can fill up their outer electron shell and gain stability.
Answer:
To fill their valance shell and become stable!
Explanation:
What is the mass of 2.90 L of O2 gas at STP
Answer:
4.16 g
Explanation:
Volume, V = 2.90 L
STP mans standard temperature and pressure
T = 273 K
P = 1 atm
Mass = ?
Using the ideal gas equation;
PV = nRT
where R = General gas constant = 0.082 L atm mol-1 K-1
n = PV / RT
n = 1 * 2.90 / (0.082 * 273)
n = 2.90 / 22.386
n = 0.130 mol
The relationship between moles and mass;
Mass = number of moles * Molar mass
Mass = 0.130 mol * 32 g/mol
Mass = 4.16 g
Answer:4.14
Explanation:just answered the question
The dissolution of water in octane (C8H18) is prevented by ________. The dissolution of water in octane (C8H18) is prevented by ________. hydrogen bonding between water molecules ion-dipole attraction between water and octane molecules repulsion between like-charged water and octane molecules dipole-dipole attraction between octane molecules London dispersion forces between octane molecules
Answer:
London dispersion forces between octane molecules
Explanation:
Water is a polar solvent and the molecules of water are held together by hydrogen bonds.
On the other hand octane is a nonpolar molecule held together only by weak dispersion forces.
We know that the interaction of substances depend on the nature of intermolecular forces present in each substance. As a result, water can not interact with octane because octane molecules predominantly have a different kind of intermolecular force between them- the London dispersion forces.
How do you write 0.000157 in scientific notation
Answer:
1.57 × 10^-4
one point five seven times ten to the power of negative four
Looking at the following equation, which is the correct order of coefficients?
NH3 + O2 --> NO + H2O
Answer: The correct order of coefficients is 4, 5, 4 and 6.
Explanation:
According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side.
The balanced chemical equation is:
[tex]4NH_3+5O_2\rightarrow 4NO+6H_2O[/tex]
The correct order of coefficients is 4, 5, 4 and 6.
The process of the body changes that cause a child's body to become capable of reproduction
Answer:
The process is called Puberty.
Gaseous methane (CH4) reacts with gaseous oxygen gas (O2) to produce gaseous carbon dioxide (CO2) and gaseous water (H2O). If 28.2 g of carbon dioxide is produced from the reaction of 15.1 g of methane and 81.2 g of oxygen gas, Calculate the percent yield of carbon dioxide. Be sure your answer has the correct number of significant digits in it.
Answer:
68.1% is percent yield of the reaction
Explanation:
The reaction of methane with oxygen is:
CH₄ + 2O₂ → CO₂ + 2H₂O
Where 2 moles of oxygen react per mole of CH₄
Percent yield is:
Actual yield (28.2g CO₂) / Theoretical yield * 100
To solve this question we need to find theoretical yield finding limiting reactant :
Moles CH₄:
15.1g CH₄ * (1mol / 16.04g) = 0.9414 moles
Moles O₂:
81.2g * (1mol / 32g) = 2.54 moles
For a complete reaction of 0.9414 moles of CH₄ are needed:
0.9414 moles CH₄ * (2 mol O₂ / 1mol CH₄) = 1.88 moles of O₂. As there are 2.54 moles, O₂ is in excess and CH₄ is limiting reactant
In theoretical yield, the moles of methane added = Moles of CO₂ produced. That is 0.9414 moles CO₂. In grams = Theoretical yield:
0.9414 moles CO₂ * (44.01g / mol) = 41.43g CO₂
Percent yield: 28.2g CO₂ / 41.43g CO₂ * 100=
68.1% is percent yield of the reactionHow many molecule are in 1.80mol of water
Answer:
1 molecule of H2O contains 10 electrons. So one mole that is equal to 22.4 L of H2O will contain 6.022 × 10^23 × 10 electrons. So 1.8 ml will have - 6.022×10^23×1.8×10/22.4 ×1000=6.022×10^21×1.8/22.4.
Explanation:
I just saw this answer here in brainly
if you start with 4.3 moles of NH3, how many moles of NANH2 can be produced
Explanation:
Mole ratio of NH3 to NaNH2 = 2 : 2.
Moles of NaNH2 produced
= 4.3mol * (2/2) = 4.3mol.
Aspirin was formed to reduce the irritation of salicylic acid. However, aspirin can still disturb the stomach. Which functional group in aspirin is responsible for stomach irritation? A. Ketone B. Ester C. Carboxylic acid D. Phenol
Answer:
Carboxylic acid
Explanation:
Asprin is a drug that contains the carboxylic acid functional group (R-COOH), ester functional group (R-O-CO-R') and the aromatic group (benzene ring).
When we take in aspirin, it becomes salicylic acid. This metabolite irreversibly inhibits the enzyme cyclooxygenase. Hence the the production of protective prostaglandins is blocked causing inflammation and pain.
Carbon monoxide and carbon dioxide have
Answer:
different chemical properties and the same physical properties
Explanation:
Both carbon monoxide and carbon dioxide are gases.
So physically, the two compounds have no fixed shape and volume and their molecules are far apart.
Therefore, they have similar physical properties.
Based on chemical properties, the compounds or molecules given are different.
They will combine chemically in diverse ways.
3. different chemical properties and the same physical properties
Physical properties:
Both carbon monoxide and carbon dioxide are gases. So physically, the two compounds have no fixed shape and volume and their molecules are far apart. Therefore, they have similar physical properties.Chemical properties:
The compounds or molecules given are different. They will combine chemically in diverse ways.Carbon Dioxide (CO₂) is a chemical compound consisting of one carbon atom and two oxygen atoms while Carbon Monoxide (CO) is a chemical compound which contains one carbon atom and one oxygen atom.CO is also a colorless and odorless gas while CO₂ is entirely human-made and is not naturally present in the atmosphere.Thus, both gases are chemically different.Therefore, option 3 is correct.
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PLEASE HELP ASAP! GIVING OUT BRAINLIEST PLEASE PLEASE HELP
Name a mixtures of at least 3 items each and how you would separate them. Explain why each of the step would work. Do not use any of the items mentioned in the previous question. (which is salt, sand, water, and iron)
Answer:
That means we do not need to use chemical reactions to separate them. ... The one liquid component in milk is water, and the other is fatty oil. ... Identify the type of substances (solid, liquid or gas) that are mixed in each
Explanation:
Answer:
[tex] \huge \sf \colorbox{pink}{hey \: there}[/tex]
Explanation:
The mixture of clay or sand with water is muddy. The small clay particles become suspended in the water. This kind of mixture is called a suspension. Suspensions are opaque; that means they are cloudy and we cannot see through them very well.
How much money will it cost you to drive 255 miles if your car gets 25.70 miles per gallon and gas costs $3.309/gallon?
11) How many moles of CO2 can be produced from
5.0 moles of O2?
Answer:
3.6 moles
Explanation:
5.0moles produce 44g/x will produce 32g the answer is a3.6moles
How many moles of aluminum will be produced from 30.0 g of Al2O3 in the following reaction?
2A1203 - 4A + 302
Moles of aluminum produced = 0.588
Further explanationGiven
30 g of Al2O3
Reaction
2Al203 ⇒ 4Al + 302
Required
moles of aluminum
Solution
mol Al2O3 :
= mass : MW
= 30 : 101,96 g/mol
= 0.294
From the equation, mol Aluminum :
= 4/2 x mol Al2O3
= 4/2 x 0.294
= 0.588
What is the main point of paragraph 3?
A Red blood cells
B the skeletal system
C the structure of a bone
D bones, cartilage, and blood vessels
nitrogen atom in NH3 has ___ shared electrons
Answer:
3
Explanation:
nitrogen atom in NH3 has 3 shared electrons.
According to the law of conservation of matter, we know that the total number of atoms does not change in a chemical reaction and thus mass is conserved. This
is part of a chemical reaction: hydrogen plus oxygen yields water. Can you complete this model? Reorganize the reactants in order to complete the product side
of the reaction
Your answer:
There is another answer choice with 4 reactants
Answer:
the answer is second option. with 2 models
Explanation:
2H2 + O2 gives 2H2O
so there's two models
How many grams of H2O are needed to produce 150 g of Mg(OH)2? (Molar mass: H2O = 18.02 g/mol; Mg(OH)2 = 58.33 g/mol )
Answer:
92.6
Explanation:
6 mol x 18.02 g of H2o --> 3 mol x 58.33 g Mg(OH)2
108.12 g of h2o --> 174.99 of Mg(OH)2
g of H2O is 150 g of Mg(OH)2
150g x 108.12g / 174.99 =
92.67
The proper dosage of a certain medication is 0.50 mg per kilogramof of patient weight. The medication is the Spence in a liquid that contains 350.0ug of medication per mL of liquid. What volume of liquid medication should be given to a 183 Ib patient. (1kg= 2.204 lb)
Answer:
118.61 mL.
Explanation:
Hello!
In this case, since we know the concentration in the medication:
[tex]\frac{350.0\mu g}{1mL}[/tex]
Now, since there are 0.50 mg of the medication per kilogram of patient, we can compute the volume as shown below for a 183-lb patient:
[tex]183lb*\frac{1kg}{2.204lb}* \frac{0.50mg}{1kg} *\frac{1000\mu g}{1mg} *\frac{1mL}{350.0\mu g} =118.61mL[/tex]
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what mass, in grams, of CO2 and H2O
is formed from 2.55 mol of propane?
Answer:
336.6 grams of CO₂ and 183.6 grams of H₂O are formed from 2.55 moles of propane.
Explanation:
In this case, the balanced reaction is:
C₃H₈ + 5 O₂ → 3 CO₂ + 4 H₂O
By stoichiometry of the reaction (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of reactant and product participate in the reaction:
C₃H₈: 1 moleO₂: 5 molesCO₂: 3 molesH₂O: 4 molesBeing the molar mass of each compound:
C₃H₈: 44 g/moleO₂: 16 g/moleCO₂: 44 g/moleH₂O: 18 g/moleThen, by stoichiometry, the following quantities of mass participate in the reaction:
C₃H₈: 1 mole* 44 g/mole= 44 gramsO₂: 5 moles* 16 g/mole= 80 gramsCO₂: 3 moles* 44 g/mole= 132 gramsH₂O: 4 moles* 18 g/mole= 72 gramsSo you can apply the following rules of three:
If by stoichiometry 1 mole of C₃H₈ forms 132 grams of CO₂, 2.55 moles of C₃H₈ how much mass of CO₂ will it form?[tex]mass of CO_{2} =\frac{2.55 moles of C_{3} H_{8}*132 gramsof CO_{2} }{ 1 mole of C_{3} H_{8}}[/tex]
mass of CO₂= 336.6 grams
If by stoichiometry 1 mole of C₃H₈ forms 72 grams of H₂O, 2.55 moles of C₃H₈ how much mass of H₂O will it form?[tex]mass of H_{2}O =\frac{2.55 moles of C_{3} H_{8}*72 gramsof H_{2}O }{ 1 mole of C_{3} H_{8}}[/tex]
mass of H₂O= 183.6 grams
336.6 grams of CO₂ and 183.6 grams of H₂O are formed from 2.55 moles of propane.
When air cools, water molecules lose energy and
or change into liquid form.
What 2 things are produced by photosynthesis? Answer please
Answer:
Oxygen and glucose
Explanation:
Plants use the sun, water, and CO2 to make their own energy. Glucose is the result, and Oxygen is just a biproduct.
Use the periodic table to select the element that best fits each of the following descriptions.
Noble gas:
O oxygen
O chlorine
Okrypton
Answer:
Krypton
Explanation: